Mary Cromwell, The Countess Fauconberg (9 February 1637 (christened) – 14 March 1713) was an English noblewoman, the third daughter of Oliver Cromwell and his wife Elizabeth Bourchier.

[1] Born in either late 1636 or early 1637, Mary Cromwell was christened on 9 February 1637.

[2] Fauconberg had been previously married to Mildred Saunderson, who had died.

[3] Lady Fauconberg's residence in London was Fauconberg House which was on the north side of Sutton Street, and on the eastern side of Soho Square.

[4] It has been claimed that, when her father's body was disinterred and symbolically executed at the Restoration, Mary bribed some guards to substitute another body for Cromwell's[5] and to give her the real body, which she arranged to have buried at Newburgh Priory, the family seat of the Fauconbergs.